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DD6單晶冷卻渦輪葉片模擬試樣拉伸性能
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國家自然科學基金 (50905143，50775183)；國家“863”計劃 (2009AA04Z418)；高等學校學科創(chuàng)新引智計劃項目 (B07050)


Tensile Property of a Modeling Specimen of DD6 Single Crystal Cooling Turbine Blade
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    摘要:

    研究了[001]取向的冷卻葉片模擬試樣的拉伸性能與斷口。分別從溫度、薄壁厚度以及氣膜孔3個方面分析對其力學性能的影響。結果表明：薄壁圓管試樣在過峰值溫度后，抗拉強度與屈服強度隨溫度上升而降低，延伸率與截面收縮率則不斷遞增；2 mm比1.5 mm薄壁試樣的抗拉強度、屈服強度、延伸率及截面收縮率都要大；帶氣膜孔試樣存在應力應變集中，導致其抗拉強度與屈服強度，延伸率與截面收縮率都要比不帶氣膜孔試樣的低。對試樣斷口進行SEM分析，結果表明在中溫和高溫條件下，斷口呈現(xiàn)不同的斷裂特點，850 ℃的試樣斷面由光滑斜平面組成，而980 ℃的斷口則以韌窩斷裂為主

    Abstract:

    Tensile properties and SEM analysis were carried out in a modeling specimen of cooling turbine blade with [001] orientation. Three factors including temperatures, thickness and cooling holes were considered to study the influences on the mechanics properties. The results show that when the temperature is higher than 850 ℃, the ultimate strength and yield strength decrease with the increment of temperature, while for the elongation and area reduction, they increase. Also, the ultimate strength and yield strength of the 2.0 mm thick specimens are higher than those of the 1.5 mm thick specimens, the same results for the elongation and area reduction. Because of the stress and strain concentrations, not only the ultimate strength and yield strength of the specimens with cooling holes are lower than those of specimens without cooling holes, but also for the percentages of elongation and area reduction. Furthermore, from the SEM analysis of the fracture faces, we conclude that at 850 ℃ the fracture surfaces are made up of smooth sloping planes, while at 980 ℃ the fracture surfaces are mainly made up of dimples

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劉大順,王佰智,韓建鋒,溫志勛,岳珠峰. DD6單晶冷卻渦輪葉片模擬試樣拉伸性能[J].稀有金屬材料與工程,2012,41(8):1362~1366.[Liu Dashun, Wang Baizhi, Han Jianfeng, Wen Zhixun, Yue Zhufeng. Tensile Property of a Modeling Specimen of DD6 Single Crystal Cooling Turbine Blade[J]. Rare Metal Materials and Engineering,2012,41(8):1362~1366.]
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  • 收稿日期:2011-08-07
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